Keystones — Lintel
Five GCSE retrieval questions · 5 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000 in standard form
Answer: 2.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 20
Answer: (x + 10)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 18.57cm -
4. Ratio Mixed ratio problems
Express the first part of 4:7 as a fraction in simplest form
Answer: 4⁄11 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 19, 41, 30, what is the missing number?
Answer: 22